Brown basic azo dye.



UNITE STATES PATENT OFFICE.

HERBERT GORKE, OF LEVERKUSEN, NEAR COLOGNE, GERMANY, ASSIGNOR TO FARBEN- FABRIKEN VORM..FRIEDR. BAYER COL. OF ELBERFELD, GERMANY, A CORPORA- TION OF GERMANY.

No Drawing.

To all whom it may concern:

Be it known that I, HERBERT GORKE, doctor of philosophy, chemist, citizen of the German Empire, residing at Leverkusen, near Cologne, Germany, have invented new and useful Improvements in Brown Basic Azo Dyes, of which the following is-a specification.

Basic azo dyestuffs prepared from triaminodiph'enyl c. 9'.

nm -mn have not yet been described and used.

I have discovered that a new class of basic azodyestufl's can be obtained from .triaminodiphenyl which dyestuffs contain this comound as middle component. These .new

yestufi's are-distinguished by the valuable property of being capable of dyeing artificial sill; (Chardonnet-silk, Glauzstolf) etc. directly in shades fast to water.

The new process for the nmnufacture of these dyestuffs consists in combining diazotized amins or acyldiamins with triamiuodiphenyl, tetrazotizing the monoazo dyestutl's thus obtained or hexazotizing the products obtained from aoidyldiamins after elimination of the acidyl group and finally combining the tetrazoor hexazocompounds thus produced either with the same or with mixtures of suitable amins; diamins, naphthylenediamins, aminonaphthols, or alkyl derivatives of these compounds.

In order to illustrate the new process more fully the following examples are given, the parts being by weight:

Example 1.: 151 parts of para-aminobenzyldimethylamin are diazotized in the usual manner and added at 05 to a solution of 310. parts of 2.4.4 -triaminedipheuylhydrochlorid in 3000 parts of water. The free acid is neutralized with soda and the mixture is after half an hour acidulated with 700 parts of hydrochloric acid. The monoazo dyestuff is then tetrazotized with 138 arts of sodium nitrite. Subsequently 250 parts of 2.4e-toluylenediamin are added to Specification of Letters Patent.

Application filed April 1, 1911. Serial No. 618,394.

BROWN BASIC AZO DYE.

Patented Aug. 1, 191 1.

the tet-razo compound and the mixture is after neutralization of the free acid with soda, stirred for some hours. It is again acidulated and the dyestutf is filtered off and dried. It dyes artificial silk in brown shades.

Example 2: 150 parts of aeetyl-paraphenylenediamin are. diazotized and combined with 310 parts of triaminodiphenyl,.as described in Example 1. The monoazo dyestutf thus obtained is tetrazotized and combined with 220 parts of meta-. henylenediamin in soda alkalin solution. fter the addition of 1500parts of hydrochloric acid the product of the reaction is boiled for from one to two hours. The solution is then cooled and the dyestutl' is filtered oil and dried. It dyes artificial silk in brown shades.

Example 3: 150 parts ,of acetyl-paraphenylencdiamin are (liazot-ized and the diazo derivative is combined with 310 parts of triaminodiphenyl as is described in Ex-' ample 1. 1000 parts of hydrochloric acid are added to the monoazo dyestufi' thus obtained and the mixture is boiled for one hour. When the solution has cooled the resulting azo dyestuff is hexazotized with 207 parts of sodium nitrite (3 molecules) and combined with 366 parts of toluylendiamin (3 molecules) in soda alkalin solution. After acidulation with hydrochloric acid the dyestuft isfiltered oil and dried. It dyes artificial silk in brownish-black shades. The dyes are after being dried and pulverized dark powders soluble in water with a brown coloration and soluble in concentrated sulfuric acid with a black coloration; yielding upon treatment with -stannous chlorid and hydrochloric acid tetraamiuodiphenyl. The process is carried out in a similar manner by using other amins or other of the above mentioned end components.

I claim: v

The herein described new basic azo dyes obtainable from triaminodiphenyl, which dyes are after being dried and pulverized dark powders soluble in water with a brown celorationand soluble in concentrated sulin hand in the preserice (if two subscribing furic acid with a black coloration; yieldin witnesses.

upon treatment with stannous clorid an HERBERT GORKE. [Lo

hydrochloric acid tetraaminodiphenyl; and v I 5 dyeing artificial silk directly brown shades Witnesses: I

fast to Water, substantially as described. CHAS. J. WRIGHT, In testimony whereof I have hereunto set ALFRED HENKEL. 

